Cystine

Cystine Impurities & Reference Standards

Cystine is a widely used active pharmaceutical ingredient (API) that plays a central role in modern drug formulation and manufacturing. Cystine is registered under CAS Number 56-89-3. The compound carries the molecular formula C6H12N2O4S2, corresponding to a molecular weight of 240.3 g/mol. Related substances and impurities of Cystine are routinely used as reference materials for stability-indicating method development, impurity profiling, and compliance with ICH, USP, BP, and EP monographs. We supply certified Cystine reference standards and impurity markers with complete documentation, including a Certificate of Analysis (CoA), HPLC chromatograms, and spectroscopic data, for pharmaceutical research, manufacturing, and regulatory use.